@book{52521,
	author = {Dana, James Dwight,},
	title = {On the four rocks of the New Haven region, East rock, West rock, Pine rock, and Mill rock, in illustration of the features of non-volcanic igneous ejections.},
	publisher = {Tuttle, Morehouse & Taylor, printers,},
	year = {1891.},
	address = {New Haven,},
	url = {http://hdl.loc.gov/loc.gdc/scd0001.00141133895}
}